Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 UID: 0 PID: 4771 Comm: syz.6.8773 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:drop_buffers+0x76/0x4f0
Code: 20 4c 8b 33 4d 89 f4 4d 8d 7c 24 60 4c 89 ff be 04 00 00 00 e8 1b 90 dc ff 4c 89 f8 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df <0f> b6 04 18 84 c0 75 60 41 8b 6c 24 60 4c 89 e0 48 c1 e8 03 80 3c
RSP: 0018:ffffc900032ed2f8 EFLAGS: 00010206
RAX: 000000000000000c RBX: dffffc0000000000 RCX: ffffffff824686d5
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000060
RBP: 0000000000000000 R08: 0000000000000064 R09: ffff800000000000
R10: dffffc0000000000 R11: ffffed1005fcda2c R12: 0000000000000000
R13: 1ffffd4000922b19 R14: ffff88802fe6d0f8 R15: 0000000000000060
FS:  00007efe8512d6c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe850e576e CR3: 000000002fc0c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 try_to_free_buffers+0x1e1/0x2d0
 shrink_folio_list+0x20ac/0x4cd0
 evict_folios+0x47f2/0x58b0
 try_to_shrink_lruvec+0x8a3/0xb50
 shrink_lruvec+0x49c/0x2980
 shrink_node+0xa4e/0x3760
 do_try_to_free_pages+0x668/0x1960
 try_to_free_mem_cgroup_pages+0x2fa/0x7e0
 try_charge_memcg+0xa40/0x1290
 charge_memcg+0x9f/0x180
 __mem_cgroup_charge+0x25/0x80
 shmem_alloc_and_add_folio+0x7c1/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 __kernel_write_iter+0x428/0x910
 dump_user_range+0x8a0/0xc90
 elf_core_dump+0x337b/0x3990
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7efe8438ebf1
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000200000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007efe845b6090 RCX: 00007efe8438ebe9
RDX: 0000200000030f40 RSI: 0000200000000030 RDI: 0000000021002000
RBP: 00007efe84411e19 R08: 0000200000030fc0 R09: 0000200000030fc0
R10: 0000200000030f80 R11: 0000000000000206 R12: 0000000000000000
R13: 00007efe845b6128 R14: 00007efe845b6090 R15: 00007fff44f834b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
